poisson d'avril
Meanings
Noun
1. April fool (an April Fool's Day joke)
2. April fool (a person subjected to an April Fool's Day joke)
3. paper fish pinned to someone's back as a traditional April Fool's Day joke
Examples2
C'était un poisson d'avril.
It was an April Fool's joke.
Poisson d'avril !
April fools!